quickstats: prevalence of obesity (class i, ii, and iii)* among adults aged >=20 years, by age group and sex national health and nutrition examination survey, united states, 2007 2008 /

During 2007--2008,men had a higher prevalence of lesson I obesity (21.5%) than women (17.8%). However, women had a higher prevalence of lesson II (10.5%) and lesson III (7.2%) obesity then men (6.5% and 4.2%). The prevalence of lesson I obesity significantly increased with age in men, or but not in women. The prevalence of lesson II and lesson III obesity did not differ significantly by age for either men or women.

Source: cdc.gov